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@@ -3,8 +3,15 @@
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<em>i.tasscap</em> calculates Tasseled Cap (Kauth Thomas, TC) transformation
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for LANDSAT-TM data (TM4, TM5, TM7).
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-<!-- ok, but what is Tasseled Cap ? -->
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-
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+The tasseled cap transformation is effectively a compression method to
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+reduce multiple spectral data into a few bands. The method was originally
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+developed for understanding important phenomena of crop development in
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+spectral space (Kauth and Thomas 1976).
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+<p>
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+Tasseled cap coefficients for Landsat 7 ETM+ at-satellite reflectance
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+(C. Huang et al., 2001), the conversion can be achieved with
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+<em>i.landsat.toar</em>.
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+<p>
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The following TC components are generated:
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<ul>
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@@ -29,7 +36,8 @@ i.tasscap -7 band1=lsat7_2002_10 band2=lsat7_2002_20 \
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Results:
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-<p><center>
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+<p>
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+<center>
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<table border=1>
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<tr>
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<td align=center>
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@@ -73,6 +81,8 @@ Results:
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<ul>
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<li>LANDSAT-4/LANDSAT-5: TC-factor changed to CRIST et al. 1986,
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Proc. IGARSS 1986, p.1467
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+<li>Crist, E. P., 1985, A TM tasseled cap equivalent transformation for reflectance
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+ factor data, Remote Sensing of Environment, 17: 301-306.
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<li>LANDSAT-7: TASSCAP factors cited from:
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DERIVATION OF A TASSELED CAP TRANSFORMATION BASED ON LANDSAT 7 AT-SATELLITE REFLECTANCE
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Chengquan Huang, Bruce Wylie, Limin Yang, Collin Homer and Gregory Zylstra Raytheon ITSS,
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Markus Neteler